Method and apparatus for locating a fault in an electrical conductor, with interference compensation
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United States of America Patent
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Dec 25, 2012
Grant Date -
Aug 19, 2010
app pub date -
Jan 27, 2010
filing date -
Jan 27, 2009
priority date (Note) -
Expired
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Abstract
A voltage pulse is transmitted into a test object, and returned reflection pulses are evaluated to determine the location of a fault in the test object. The return signal includes a reflection from the fault and undesired interfering reflection pulses, which are removed or compensated-out from the return signal to produce a corrected pulse diagram. A circuit arrangement for this includes a bi-directional coupler, a separation filter, a measured signal detection circuit with two input channels, a memory storing a database, a computer processor, and a measured signal evaluation unit. A method in this regard includes a first step of measuring the input impedance of the test object, and a second step of measuring the return signal pulses, transforming the return signal to the frequency domain, compensating the frequency domain data to remove interference, transforming the data back to the time domain, and representing or evaluating the pulse diagram.
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